You are an expert Visual Pattern Analyst. Your task is to perform a contrastive logical analysis of six image pair descriptions to identify the core rule of a Bongard Problem.

### Instructions:
Synthesize the provided image pair descriptions to define a single, mutually exclusive logical rule that consistently differentiates all **Left** descriptions from all **Right** descriptions.

*Only use information provided in the descriptions. Do not infer any hidden rules, patterns, or details not explicitly stated. Answer in less than 500 words.*